Sediment remediation: U.S. focus on capping and monitored natural recovery

摘要: The Battelle Conferences series represent the state-of-the-art of emerging technologies, science and management issues for contaminated sediment remediation. In 2007 Conference held in Savannah, GA, two situ technologies cleanup sites were at centre interest: Sediment capping, a form containment, which involves placement subaqueous covering clean and/or other materials to isolate sediments, monitored natural recovery (MNR), where processes are used mitigate transfer particle-bound contaminants into water phase biota. A third priority technology Superfund program, recommended by U.S. Environmental Protection Agency (EPA), is environmental dredging, i.e., removing sediments from aquatic environment. About 30 platform or poster presentations dealt with capping as technology, reflecting rapid developments this field, both assessments enhancements ‘classic’ passive caps development demonstration active technologies. Issues relevant spread throughout many sessions; e.g., contaminant source identification, control, remediation strategies; innovative characterization assessment, chemical/toxicological/biological measurements characterization, bioavailability contaminants, fate transport effectiveness: defining, monitoring, demonstrating success. Presentations addressing role stakeholder input complemented discussions on importance data quality considerations, uncertainty analysis, careful selection reference highlighted complex nature these multidisciplinary assessments. Case studies, site-specific information was linked regional objectives, various approaches watershed-scale assessment management, ecosystem all discussed sessions, well complementary panel discussion. One compelling feature Savannah (relative first couple meetings) that there much larger number provided tools, models, case etc fill lines evidence allow fair comparison between removal when appropriate, growing acceptance residuals impacts can times offset perceived benefits, so be considered if exposure risk properly assessed.